PWX 2021

A Basic Framework for Selection of Trenchless Renewal Technologies for Pressurized Pipelines (Room 275)

01 Sep 21
8:30 AM - 9:20 AM

Tracks: Water Resources: Water/Wastewater

Pipelines that carry flows under pressure represent a special set of challenges for water and sewer rehabilitation. Historically, the most common renewal technology employed has been to replace the pipeline using open cut construction. Part of the reason for that choice has been a lack of trenchless rehabilitation technologies appropriate for pressurized pipelines. A lack of investment in the aging pressure pipe infrastructure, coupled with growing congestion both above and below ground, has accelerated development in the trenchless rehabilitation industry. With an ever-increasing number of proven trenchless rehabilitation technologies, how does a utility owner or engineer determine the appropriate technology to specify? This presentation briefly reviews many of the common and emerging trenchless technologies for pressurized pipeline rehabilitation and provides a basic framework that can be utilized to evaluate and select an appropriate solution. Presenters will review the concept of structural classification of pressure pipe linings as defined in AWWA publications, which is a critical component to selecting an appropriate trenchless technology. They’ll also review several case studies that demonstrate how the basic framework was followed to select a trenchless technology solution.